However a 'Universal indicator' is used, which is a mixed indicator. It not only shows whether the solution is acidic or basic, but also shows the approximate pH values by giving a wider range of colours for different values of pH (Fig. 8.5).
Indicators
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Indicators are the chemicals that when added to solutions show whether the solution is acidic or basic, by a sudden change of their colour. The common indicators used and the colour changes observed are mentioned below:
The indicators ordinarily used in the laboratory only indicate whether the solution is acidic, basic or neutral. They cannot give any idea as to the comparative strength of various solutions.
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